Which type of winding is used in 3 phase shell-type transformer?
Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular type
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For a transformer, operating at constant load current, maximum efficiency will occur at______________?
For a transformer, operating at constant load current, maximum efficiency will occur at______________?
A. 0.8 leading power factor
B. 0.8 lagging power factor
C. zero power factor
D. unity power factorThe maximum load that a power transformer can carry is limited by its________________?
The maximum load that a power transformer can carry is limited by its________________?
A. temperature rise
B. dielectric strength of oil
C. voltage ratio
D. copper lossThe size of a transformer core will depend on__________?
The size of a transformer core will depend on__________?
A. frequency
B. area of the core
C. flux density of the core material
D. A. and B. bothIf the supply frequency to the transformer is increased,”the iron loss will__________?
If the supply frequency to the transformer is increased,”the iron loss will__________?
A. not change
B. decrease
C. increase
D. any of the aboveA shell-type transformer has_________?
A shell-type transformer has_________?
A. high eddy current losses
B. reduced magnetic leakage
C. negligibly hysteresis losses
D. none of the aboveThe value of flux involved m the e.m.f. equation of a transformer is____________?
The value of flux involved m the e.m.f. equation of a transformer is____________?
A. average value
B. r.m.s. value
C. maximum value
D. instantaneous value